mirror of
https://git.code.sf.net/p/quake/quakeforge-old
synced 2024-11-25 05:11:23 +00:00
c3f5581b0a
Unchained, Ultimate, Ultra, Up Yours, Underworld, Underground, Unified, Unity, etc. You know the drill. This takes care of the "standalone" problem with the wrong name, and the recent snafu with multiple developers working on the same files simultaneously...expect me (and probably others) to start locking dirs when updates are taking place. And yes, this update is really as large as it looks. Software only at the moment, but I will have the makefile updated to build the GL builds as well.
774 lines
15 KiB
C
774 lines
15 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// r_edge.c
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#include "quakedef.h"
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#include "r_local.h"
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#if 0
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// FIXME
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the complex cases add new polys on most lines, so dont optimize for keeping them the same
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have multiple free span lists to try to get better coherence?
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low depth complexity -- 1 to 3 or so
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this breaks spans at every edge, even hidden ones (bad)
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have a sentinal at both ends?
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#endif
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edge_t *auxedges;
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edge_t *r_edges, *edge_p, *edge_max;
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surf_t *surfaces, *surface_p, *surf_max;
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// surfaces are generated in back to front order by the bsp, so if a surf
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// pointer is greater than another one, it should be drawn in front
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// surfaces[1] is the background, and is used as the active surface stack
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edge_t *newedges[MAXHEIGHT];
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edge_t *removeedges[MAXHEIGHT];
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espan_t *span_p, *max_span_p;
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int r_currentkey;
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extern int screenwidth;
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int current_iv;
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int edge_head_u_shift20, edge_tail_u_shift20;
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static void (*pdrawfunc)(void);
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edge_t edge_head;
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edge_t edge_tail;
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edge_t edge_aftertail;
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edge_t edge_sentinel;
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float fv;
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void R_GenerateSpans (void);
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void R_GenerateSpansBackward (void);
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void R_LeadingEdge (edge_t *edge);
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void R_LeadingEdgeBackwards (edge_t *edge);
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void R_TrailingEdge (surf_t *surf, edge_t *edge);
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//=============================================================================
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/*
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==============
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R_DrawCulledPolys
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==============
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*/
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void R_DrawCulledPolys (void)
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{
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surf_t *s;
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msurface_t *pface;
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currententity = &cl_entities[0];
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if (r_worldpolysbacktofront)
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{
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for (s=surface_p-1 ; s>&surfaces[1] ; s--)
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{
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if (!s->spans)
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continue;
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if (!(s->flags & SURF_DRAWBACKGROUND))
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{
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pface = (msurface_t *)s->data;
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R_RenderPoly (pface, 15);
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}
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}
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}
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else
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{
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for (s = &surfaces[1] ; s<surface_p ; s++)
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{
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if (!s->spans)
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continue;
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if (!(s->flags & SURF_DRAWBACKGROUND))
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{
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pface = (msurface_t *)s->data;
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R_RenderPoly (pface, 15);
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}
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}
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}
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}
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/*
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==============
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R_BeginEdgeFrame
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==============
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*/
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void R_BeginEdgeFrame (void)
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{
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int v;
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edge_p = r_edges;
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edge_max = &r_edges[r_numallocatededges];
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surface_p = &surfaces[2]; // background is surface 1,
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// surface 0 is a dummy
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surfaces[1].spans = NULL; // no background spans yet
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surfaces[1].flags = SURF_DRAWBACKGROUND;
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// put the background behind everything in the world
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if (r_draworder.value)
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{
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pdrawfunc = R_GenerateSpansBackward;
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surfaces[1].key = 0;
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r_currentkey = 1;
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}
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else
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{
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pdrawfunc = R_GenerateSpans;
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surfaces[1].key = 0x7FFFFFFF;
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r_currentkey = 0;
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}
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// FIXME: set with memset
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for (v=r_refdef.vrect.y ; v<r_refdef.vrectbottom ; v++)
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{
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newedges[v] = removeedges[v] = NULL;
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}
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}
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#if !id386
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/*
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==============
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R_InsertNewEdges
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Adds the edges in the linked list edgestoadd, adding them to the edges in the
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linked list edgelist. edgestoadd is assumed to be sorted on u, and non-empty (this is actually newedges[v]). edgelist is assumed to be sorted on u, with a
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sentinel at the end (actually, this is the active edge table starting at
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edge_head.next).
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==============
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*/
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void R_InsertNewEdges (edge_t *edgestoadd, edge_t *edgelist)
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{
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edge_t *next_edge;
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do
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{
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next_edge = edgestoadd->next;
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edgesearch:
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist=edgelist->next;
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist=edgelist->next;
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist=edgelist->next;
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if (edgelist->u >= edgestoadd->u)
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goto addedge;
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edgelist=edgelist->next;
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goto edgesearch;
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// insert edgestoadd before edgelist
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addedge:
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edgestoadd->next = edgelist;
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edgestoadd->prev = edgelist->prev;
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edgelist->prev->next = edgestoadd;
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edgelist->prev = edgestoadd;
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} while ((edgestoadd = next_edge) != NULL);
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}
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#endif // !id386
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#if !id386
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/*
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==============
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R_RemoveEdges
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==============
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*/
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void R_RemoveEdges (edge_t *pedge)
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{
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do
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{
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pedge->next->prev = pedge->prev;
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pedge->prev->next = pedge->next;
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} while ((pedge = pedge->nextremove) != NULL);
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}
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#endif // !id386
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#if !id386
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/*
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==============
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R_StepActiveU
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==============
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*/
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void R_StepActiveU (edge_t *pedge)
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{
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edge_t *pnext_edge, *pwedge;
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while (1)
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{
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nextedge:
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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pedge->u += pedge->u_step;
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if (pedge->u < pedge->prev->u)
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goto pushback;
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pedge = pedge->next;
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goto nextedge;
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pushback:
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if (pedge == &edge_aftertail)
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return;
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// push it back to keep it sorted
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pnext_edge = pedge->next;
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// pull the edge out of the edge list
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pedge->next->prev = pedge->prev;
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pedge->prev->next = pedge->next;
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// find out where the edge goes in the edge list
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pwedge = pedge->prev->prev;
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while (pwedge->u > pedge->u)
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{
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pwedge = pwedge->prev;
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}
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// put the edge back into the edge list
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pedge->next = pwedge->next;
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pedge->prev = pwedge;
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pedge->next->prev = pedge;
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pwedge->next = pedge;
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pedge = pnext_edge;
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if (pedge == &edge_tail)
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return;
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}
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}
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#endif // !id386
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/*
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==============
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R_CleanupSpan
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==============
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*/
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void R_CleanupSpan ()
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{
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surf_t *surf;
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int iu;
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espan_t *span;
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// now that we've reached the right edge of the screen, we're done with any
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// unfinished surfaces, so emit a span for whatever's on top
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surf = surfaces[1].next;
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iu = edge_tail_u_shift20;
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if (iu > surf->last_u)
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{
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span = span_p++;
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span->u = surf->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf->spans;
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surf->spans = span;
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}
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// reset spanstate for all surfaces in the surface stack
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do
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{
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surf->spanstate = 0;
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surf = surf->next;
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} while (surf != &surfaces[1]);
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}
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/*
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==============
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R_LeadingEdgeBackwards
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==============
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*/
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void R_LeadingEdgeBackwards (edge_t *edge)
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{
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espan_t *span;
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surf_t *surf, *surf2;
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int iu;
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// it's adding a new surface in, so find the correct place
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surf = &surfaces[edge->surfs[1]];
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// don't start a span if this is an inverted span, with the end
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// edge preceding the start edge (that is, we've already seen the
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// end edge)
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if (++surf->spanstate == 1)
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{
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surf2 = surfaces[1].next;
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if (surf->key > surf2->key)
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goto newtop;
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// if it's two surfaces on the same plane, the one that's already
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// active is in front, so keep going unless it's a bmodel
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if (surf->insubmodel && (surf->key == surf2->key))
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{
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// must be two bmodels in the same leaf; don't care, because they'll
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// never be farthest anyway
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goto newtop;
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}
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continue_search:
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do
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{
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surf2 = surf2->next;
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} while (surf->key < surf2->key);
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if (surf->key == surf2->key)
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{
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// if it's two surfaces on the same plane, the one that's already
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// active is in front, so keep going unless it's a bmodel
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if (!surf->insubmodel)
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goto continue_search;
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// must be two bmodels in the same leaf; don't care which is really
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// in front, because they'll never be farthest anyway
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}
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goto gotposition;
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newtop:
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// emit a span (obscures current top)
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iu = edge->u >> 20;
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if (iu > surf2->last_u)
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{
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span = span_p++;
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span->u = surf2->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf2->spans;
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surf2->spans = span;
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}
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// set last_u on the new span
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surf->last_u = iu;
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gotposition:
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// insert before surf2
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surf->next = surf2;
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surf->prev = surf2->prev;
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surf2->prev->next = surf;
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surf2->prev = surf;
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}
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}
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/*
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==============
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R_TrailingEdge
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==============
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*/
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void R_TrailingEdge (surf_t *surf, edge_t *edge)
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{
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espan_t *span;
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int iu;
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// don't generate a span if this is an inverted span, with the end
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// edge preceding the start edge (that is, we haven't seen the
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// start edge yet)
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if (--surf->spanstate == 0)
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{
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if (surf->insubmodel)
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r_bmodelactive--;
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if (surf == surfaces[1].next)
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{
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// emit a span (current top going away)
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iu = edge->u >> 20;
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if (iu > surf->last_u)
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{
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span = span_p++;
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span->u = surf->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf->spans;
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surf->spans = span;
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}
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// set last_u on the surface below
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surf->next->last_u = iu;
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}
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surf->prev->next = surf->next;
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surf->next->prev = surf->prev;
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}
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}
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#if !id386
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/*
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==============
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R_LeadingEdge
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==============
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*/
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void R_LeadingEdge (edge_t *edge)
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{
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espan_t *span;
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surf_t *surf, *surf2;
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int iu;
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double fu, newzi, testzi, newzitop, newzibottom;
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if (edge->surfs[1])
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{
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// it's adding a new surface in, so find the correct place
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surf = &surfaces[edge->surfs[1]];
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// don't start a span if this is an inverted span, with the end
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// edge preceding the start edge (that is, we've already seen the
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// end edge)
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if (++surf->spanstate == 1)
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{
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if (surf->insubmodel)
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r_bmodelactive++;
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surf2 = surfaces[1].next;
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if (surf->key < surf2->key)
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goto newtop;
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// if it's two surfaces on the same plane, the one that's already
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// active is in front, so keep going unless it's a bmodel
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if (surf->insubmodel && (surf->key == surf2->key))
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{
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// must be two bmodels in the same leaf; sort on 1/z
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fu = (float)(edge->u - 0xFFFFF) * (1.0 / 0x100000);
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newzi = surf->d_ziorigin + fv*surf->d_zistepv +
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fu*surf->d_zistepu;
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newzibottom = newzi * 0.99;
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testzi = surf2->d_ziorigin + fv*surf2->d_zistepv +
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fu*surf2->d_zistepu;
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if (newzibottom >= testzi)
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{
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goto newtop;
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}
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newzitop = newzi * 1.01;
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if (newzitop >= testzi)
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{
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if (surf->d_zistepu >= surf2->d_zistepu)
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{
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goto newtop;
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}
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}
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}
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continue_search:
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do
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{
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surf2 = surf2->next;
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} while (surf->key > surf2->key);
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if (surf->key == surf2->key)
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{
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// if it's two surfaces on the same plane, the one that's already
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// active is in front, so keep going unless it's a bmodel
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if (!surf->insubmodel)
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goto continue_search;
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// must be two bmodels in the same leaf; sort on 1/z
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fu = (float)(edge->u - 0xFFFFF) * (1.0 / 0x100000);
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newzi = surf->d_ziorigin + fv*surf->d_zistepv +
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fu*surf->d_zistepu;
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newzibottom = newzi * 0.99;
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testzi = surf2->d_ziorigin + fv*surf2->d_zistepv +
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fu*surf2->d_zistepu;
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if (newzibottom >= testzi)
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{
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goto gotposition;
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}
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newzitop = newzi * 1.01;
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if (newzitop >= testzi)
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{
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if (surf->d_zistepu >= surf2->d_zistepu)
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{
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goto gotposition;
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}
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}
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goto continue_search;
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}
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goto gotposition;
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newtop:
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// emit a span (obscures current top)
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iu = edge->u >> 20;
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if (iu > surf2->last_u)
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{
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span = span_p++;
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span->u = surf2->last_u;
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span->count = iu - span->u;
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span->v = current_iv;
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span->pnext = surf2->spans;
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surf2->spans = span;
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}
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// set last_u on the new span
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surf->last_u = iu;
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gotposition:
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// insert before surf2
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surf->next = surf2;
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surf->prev = surf2->prev;
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surf2->prev->next = surf;
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surf2->prev = surf;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
==============
|
|
R_GenerateSpans
|
|
==============
|
|
*/
|
|
void R_GenerateSpans (void)
|
|
{
|
|
edge_t *edge;
|
|
surf_t *surf;
|
|
|
|
r_bmodelactive = 0;
|
|
|
|
// clear active surfaces to just the background surface
|
|
surfaces[1].next = surfaces[1].prev = &surfaces[1];
|
|
surfaces[1].last_u = edge_head_u_shift20;
|
|
|
|
// generate spans
|
|
for (edge=edge_head.next ; edge != &edge_tail; edge=edge->next)
|
|
{
|
|
if (edge->surfs[0])
|
|
{
|
|
// it has a left surface, so a surface is going away for this span
|
|
surf = &surfaces[edge->surfs[0]];
|
|
|
|
R_TrailingEdge (surf, edge);
|
|
|
|
if (!edge->surfs[1])
|
|
continue;
|
|
}
|
|
|
|
R_LeadingEdge (edge);
|
|
}
|
|
|
|
R_CleanupSpan ();
|
|
}
|
|
|
|
#endif // !id386
|
|
|
|
|
|
/*
|
|
==============
|
|
R_GenerateSpansBackward
|
|
==============
|
|
*/
|
|
void R_GenerateSpansBackward (void)
|
|
{
|
|
edge_t *edge;
|
|
|
|
r_bmodelactive = 0;
|
|
|
|
// clear active surfaces to just the background surface
|
|
surfaces[1].next = surfaces[1].prev = &surfaces[1];
|
|
surfaces[1].last_u = edge_head_u_shift20;
|
|
|
|
// generate spans
|
|
for (edge=edge_head.next ; edge != &edge_tail; edge=edge->next)
|
|
{
|
|
if (edge->surfs[0])
|
|
R_TrailingEdge (&surfaces[edge->surfs[0]], edge);
|
|
|
|
if (edge->surfs[1])
|
|
R_LeadingEdgeBackwards (edge);
|
|
}
|
|
|
|
R_CleanupSpan ();
|
|
}
|
|
|
|
|
|
/*
|
|
==============
|
|
R_ScanEdges
|
|
|
|
Input:
|
|
newedges[] array
|
|
this has links to edges, which have links to surfaces
|
|
|
|
Output:
|
|
Each surface has a linked list of its visible spans
|
|
==============
|
|
*/
|
|
void R_ScanEdges (void)
|
|
{
|
|
int iv, bottom;
|
|
byte basespans[MAXSPANS*sizeof(espan_t)+CACHE_SIZE];
|
|
espan_t *basespan_p;
|
|
surf_t *s;
|
|
|
|
basespan_p = (espan_t *)
|
|
((long)(basespans + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
|
|
max_span_p = &basespan_p[MAXSPANS - r_refdef.vrect.width];
|
|
|
|
span_p = basespan_p;
|
|
|
|
// clear active edges to just the background edges around the whole screen
|
|
// FIXME: most of this only needs to be set up once
|
|
edge_head.u = r_refdef.vrect.x << 20;
|
|
edge_head_u_shift20 = edge_head.u >> 20;
|
|
edge_head.u_step = 0;
|
|
edge_head.prev = NULL;
|
|
edge_head.next = &edge_tail;
|
|
edge_head.surfs[0] = 0;
|
|
edge_head.surfs[1] = 1;
|
|
|
|
edge_tail.u = (r_refdef.vrectright << 20) + 0xFFFFF;
|
|
edge_tail_u_shift20 = edge_tail.u >> 20;
|
|
edge_tail.u_step = 0;
|
|
edge_tail.prev = &edge_head;
|
|
edge_tail.next = &edge_aftertail;
|
|
edge_tail.surfs[0] = 1;
|
|
edge_tail.surfs[1] = 0;
|
|
|
|
edge_aftertail.u = -1; // force a move
|
|
edge_aftertail.u_step = 0;
|
|
edge_aftertail.next = &edge_sentinel;
|
|
edge_aftertail.prev = &edge_tail;
|
|
|
|
// FIXME: do we need this now that we clamp x in r_draw.c?
|
|
edge_sentinel.u = 2000 << 24; // make sure nothing sorts past this
|
|
edge_sentinel.prev = &edge_aftertail;
|
|
|
|
//
|
|
// process all scan lines
|
|
//
|
|
bottom = r_refdef.vrectbottom - 1;
|
|
|
|
for (iv=r_refdef.vrect.y ; iv<bottom ; iv++)
|
|
{
|
|
current_iv = iv;
|
|
fv = (float)iv;
|
|
|
|
// mark that the head (background start) span is pre-included
|
|
surfaces[1].spanstate = 1;
|
|
|
|
if (newedges[iv])
|
|
{
|
|
R_InsertNewEdges (newedges[iv], edge_head.next);
|
|
}
|
|
|
|
(*pdrawfunc) ();
|
|
|
|
// flush the span list if we can't be sure we have enough spans left for
|
|
// the next scan
|
|
if (span_p >= max_span_p)
|
|
{
|
|
VID_UnlockBuffer ();
|
|
S_ExtraUpdate (); // don't let sound get messed up if going slow
|
|
VID_LockBuffer ();
|
|
|
|
if (r_drawculledpolys)
|
|
{
|
|
R_DrawCulledPolys ();
|
|
}
|
|
else
|
|
{
|
|
D_DrawSurfaces ();
|
|
}
|
|
|
|
// clear the surface span pointers
|
|
for (s = &surfaces[1] ; s<surface_p ; s++)
|
|
s->spans = NULL;
|
|
|
|
span_p = basespan_p;
|
|
}
|
|
|
|
if (removeedges[iv])
|
|
R_RemoveEdges (removeedges[iv]);
|
|
|
|
if (edge_head.next != &edge_tail)
|
|
R_StepActiveU (edge_head.next);
|
|
}
|
|
|
|
// do the last scan (no need to step or sort or remove on the last scan)
|
|
|
|
current_iv = iv;
|
|
fv = (float)iv;
|
|
|
|
// mark that the head (background start) span is pre-included
|
|
surfaces[1].spanstate = 1;
|
|
|
|
if (newedges[iv])
|
|
R_InsertNewEdges (newedges[iv], edge_head.next);
|
|
|
|
(*pdrawfunc) ();
|
|
|
|
// draw whatever's left in the span list
|
|
if (r_drawculledpolys)
|
|
R_DrawCulledPolys ();
|
|
else
|
|
D_DrawSurfaces ();
|
|
}
|
|
|
|
|